<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        var reg=/傻/g;
        var p="你傻呀，这么菜,你真是傻"
        /* replace */
        var res= p.replace(reg,"**")
        console.log(res)  //你**呀，这么菜,你真是**
    </script>
</body>
</html>